1 //===--- CompilerInvocation.cpp -------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "clang/Frontend/CompilerInvocation.h"
11 #include "clang/Basic/Diagnostic.h"
12 #include "clang/Basic/FileManager.h"
13 #include "clang/Basic/Version.h"
14 #include "clang/Driver/Arg.h"
15 #include "clang/Driver/ArgList.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/OptTable.h"
18 #include "clang/Driver/Option.h"
19 #include "clang/Driver/Options.h"
20 #include "clang/Frontend/LangStandard.h"
21 #include "clang/Lex/HeaderSearchOptions.h"
22 #include "clang/Serialization/ASTReader.h"
23 #include "llvm/ADT/Hashing.h"
24 #include "llvm/ADT/OwningPtr.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/StringSwitch.h"
28 #include "llvm/ADT/Triple.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/Host.h"
31 #include "llvm/Support/Path.h"
32 using namespace clang;
33 
34 //===----------------------------------------------------------------------===//
35 // Initialization.
36 //===----------------------------------------------------------------------===//
37 
38 CompilerInvocationBase::CompilerInvocationBase()
39   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
40     DiagnosticOpts(new DiagnosticOptions()),
41     HeaderSearchOpts(new HeaderSearchOptions()),
42     PreprocessorOpts(new PreprocessorOptions()) {}
43 
44 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
45   : RefCountedBase<CompilerInvocation>(),
46     LangOpts(new LangOptions(*X.getLangOpts())),
47     TargetOpts(new TargetOptions(X.getTargetOpts())),
48     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
49     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
50     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
51 
52 //===----------------------------------------------------------------------===//
53 // Deserialization (from args)
54 //===----------------------------------------------------------------------===//
55 
56 using namespace clang::driver;
57 using namespace clang::driver::options;
58 
59 //
60 
61 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
62                                      DiagnosticsEngine &Diags) {
63   unsigned DefaultOpt = 0;
64   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
65     DefaultOpt = 2;
66 
67   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
68     if (A->getOption().matches(options::OPT_O0))
69       return 0;
70 
71     assert (A->getOption().matches(options::OPT_O));
72 
73     StringRef S(A->getValue());
74     if (S == "s" || S == "z" || S.empty())
75       return 2;
76 
77     return Args.getLastArgIntValue(OPT_O, DefaultOpt, Diags);
78   }
79 
80   return DefaultOpt;
81 }
82 
83 static unsigned getOptimizationLevelSize(ArgList &Args, InputKind IK,
84                                          DiagnosticsEngine &Diags) {
85   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
86     if (A->getOption().matches(options::OPT_O)) {
87       switch (A->getValue()[0]) {
88       default:
89         return 0;
90       case 's':
91         return 1;
92       case 'z':
93         return 2;
94       }
95     }
96   }
97   return 0;
98 }
99 
100 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
101   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
102          E = Args.filtered_end(); I != E; ++I) {
103     Arg *A = *I;
104     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
105     // to the warning list. Else, add its value (for the OPT_W case).
106     if (A->getOption().getKind() == Option::FlagClass) {
107       Warnings.push_back(A->getOption().getName().substr(1));
108     } else {
109       for (unsigned Idx = 0, End = A->getNumValues();
110            Idx < End; ++Idx) {
111         StringRef V = A->getValue(Idx);
112         // "-Wl," and such are not warning options.
113         // FIXME: Should be handled by putting these in separate flags.
114         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
115           continue;
116 
117         Warnings.push_back(V);
118       }
119     }
120   }
121 }
122 
123 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
124                               DiagnosticsEngine &Diags) {
125   using namespace options;
126   bool Success = true;
127   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
128     StringRef Name = A->getValue();
129     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
130 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
131       .Case(CMDFLAG, NAME##Model)
132 #include "clang/StaticAnalyzer/Core/Analyses.def"
133       .Default(NumStores);
134     if (Value == NumStores) {
135       Diags.Report(diag::err_drv_invalid_value)
136         << A->getAsString(Args) << Name;
137       Success = false;
138     } else {
139       Opts.AnalysisStoreOpt = Value;
140     }
141   }
142 
143   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
144     StringRef Name = A->getValue();
145     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
146 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
147       .Case(CMDFLAG, NAME##Model)
148 #include "clang/StaticAnalyzer/Core/Analyses.def"
149       .Default(NumConstraints);
150     if (Value == NumConstraints) {
151       Diags.Report(diag::err_drv_invalid_value)
152         << A->getAsString(Args) << Name;
153       Success = false;
154     } else {
155       Opts.AnalysisConstraintsOpt = Value;
156     }
157   }
158 
159   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
160     StringRef Name = A->getValue();
161     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
162 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN, AUTOCREAT) \
163       .Case(CMDFLAG, PD_##NAME)
164 #include "clang/StaticAnalyzer/Core/Analyses.def"
165       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
166     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
167       Diags.Report(diag::err_drv_invalid_value)
168         << A->getAsString(Args) << Name;
169       Success = false;
170     } else {
171       Opts.AnalysisDiagOpt = Value;
172     }
173   }
174 
175   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
176     StringRef Name = A->getValue();
177     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
178 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
179       .Case(CMDFLAG, NAME)
180 #include "clang/StaticAnalyzer/Core/Analyses.def"
181       .Default(NumPurgeModes);
182     if (Value == NumPurgeModes) {
183       Diags.Report(diag::err_drv_invalid_value)
184         << A->getAsString(Args) << Name;
185       Success = false;
186     } else {
187       Opts.AnalysisPurgeOpt = Value;
188     }
189   }
190 
191   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
192     StringRef Name = A->getValue();
193     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
194 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
195       .Case(CMDFLAG, NAME)
196 #include "clang/StaticAnalyzer/Core/Analyses.def"
197       .Default(NumInliningModes);
198     if (Value == NumInliningModes) {
199       Diags.Report(diag::err_drv_invalid_value)
200         << A->getAsString(Args) << Name;
201       Success = false;
202     } else {
203       Opts.InliningMode = Value;
204     }
205   }
206 
207   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
208   Opts.visualizeExplodedGraphWithGraphViz =
209     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
210   Opts.visualizeExplodedGraphWithUbiGraph =
211     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
212   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
213   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
214   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
215   Opts.AnalyzeNestedBlocks =
216     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
217   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
218   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
219   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
220   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
221   Opts.maxBlockVisitOnPath = Args.getLastArgIntValue(OPT_analyzer_max_loop, 4, Diags);
222   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
223   Opts.InlineMaxStackDepth =
224     Args.getLastArgIntValue(OPT_analyzer_inline_max_stack_depth,
225                             Opts.InlineMaxStackDepth, Diags);
226 
227   Opts.CheckersControlList.clear();
228   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
229                                              OPT_analyzer_disable_checker),
230          ie = Args.filtered_end(); it != ie; ++it) {
231     const Arg *A = *it;
232     A->claim();
233     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
234     // We can have a list of comma separated checker names, e.g:
235     // '-analyzer-checker=cocoa,unix'
236     StringRef checkerList = A->getValue();
237     SmallVector<StringRef, 4> checkers;
238     checkerList.split(checkers, ",");
239     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
240       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
241   }
242 
243   // Go through the analyzer configuration options.
244   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
245        ie = Args.filtered_end(); it != ie; ++it) {
246     const Arg *A = *it;
247     A->claim();
248     // We can have a list of comma separated config names, e.g:
249     // '-analyzer-config key1=val1,key2=val2'
250     StringRef configList = A->getValue();
251     SmallVector<StringRef, 4> configVals;
252     configList.split(configVals, ",");
253     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
254       StringRef key, val;
255       llvm::tie(key, val) = configVals[i].split("=");
256       if (val.empty()) {
257         Diags.Report(SourceLocation(),
258                      diag::err_analyzer_config_no_value) << configVals[i];
259         Success = false;
260         break;
261       }
262       if (val.find('=') != StringRef::npos) {
263         Diags.Report(SourceLocation(),
264                      diag::err_analyzer_config_multiple_values)
265           << configVals[i];
266         Success = false;
267         break;
268       }
269       Opts.Config[key] = val;
270     }
271   }
272 
273   return Success;
274 }
275 
276 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
277   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
278   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
279   return true;
280 }
281 
282 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
283   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
284 }
285 
286 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
287                              DiagnosticsEngine &Diags) {
288   using namespace options;
289   bool Success = true;
290 
291   unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
292   if (OptLevel > 3) {
293     Diags.Report(diag::err_drv_invalid_value)
294       << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
295     OptLevel = 3;
296     Success = false;
297   }
298   Opts.OptimizationLevel = OptLevel;
299 
300   // We must always run at least the always inlining pass.
301   Opts.setInlining(
302     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
303                                  : CodeGenOptions::OnlyAlwaysInlining);
304   // -fno-inline-functions overrides OptimizationLevel > 1.
305   Opts.NoInline = Args.hasArg(OPT_fno_inline);
306   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
307                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
308 
309   if (Args.hasArg(OPT_gline_tables_only)) {
310     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
311   } else if (Args.hasArg(OPT_g_Flag)) {
312     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
313       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
314     else
315       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
316   }
317   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
318   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
319 
320   Opts.ModulesAutolink = Args.hasArg(OPT_fmodules_autolink);
321   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
322   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
323   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
324   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
325     OPT_fuse_register_sized_bitfield_access);
326   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
327   Opts.StructPathTBAA = Args.hasArg(OPT_struct_path_tbaa);
328   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
329   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
330   Opts.NoCommon = Args.hasArg(OPT_fno_common);
331   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
332   Opts.OptimizeSize = getOptimizationLevelSize(Args, IK, Diags);
333   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
334                             Args.hasArg(OPT_ffreestanding));
335   Opts.UnrollLoops = Args.hasArg(OPT_funroll_loops) ||
336                      (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize);
337 
338   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
339   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
340   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
341   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
342   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
343   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
344   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
345   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
346   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
347   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
348   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
349   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
350   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
351   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
352                        Args.hasArg(OPT_cl_finite_math_only)||
353                        Args.hasArg(OPT_cl_fast_relaxed_math));
354   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
355                        Args.hasArg(OPT_cl_finite_math_only)||
356                        Args.hasArg(OPT_cl_fast_relaxed_math));
357   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
358   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
359   Opts.NumRegisterParameters = Args.getLastArgIntValue(OPT_mregparm, 0, Diags);
360   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
361   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
362   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
363   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
364   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
365   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
366   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
367   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
368   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
369   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
370   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
371                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
372                       Args.hasArg(OPT_cl_fast_relaxed_math);
373   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
374   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
375   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
376   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
377 
378   Opts.FunctionSections = Args.hasArg(OPT_ffunction_sections);
379   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
380 
381   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
382   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
383   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
384 
385   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
386   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
387   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
388   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
389   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
390     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
391     Opts.CoverageNoFunctionNamesInData =
392         Args.hasArg(OPT_coverage_no_function_names_in_data);
393     if (Args.hasArg(OPT_coverage_version_EQ)) {
394       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
395       if (CoverageVersion.size() != 4) {
396         Diags.Report(diag::err_drv_invalid_value)
397             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
398             << CoverageVersion;
399       } else {
400         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
401       }
402     }
403   }
404 
405   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
406   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
407   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
408   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
409   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
410   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
411   Opts.SanitizeMemoryTrackOrigins =
412     Args.hasArg(OPT_fsanitize_memory_track_origins);
413   Opts.SanitizeAddressZeroBaseShadow =
414     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
415   Opts.SanitizeUndefinedTrapOnError =
416     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
417   Opts.SSPBufferSize =
418     Args.getLastArgIntValue(OPT_stack_protector_buffer_size, 8, Diags);
419   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
420   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
421     StringRef Val = A->getValue();
422     unsigned StackAlignment = Opts.StackAlignment;
423     Val.getAsInteger(10, StackAlignment);
424     Opts.StackAlignment = StackAlignment;
425   }
426 
427   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
428     StringRef Name = A->getValue();
429     unsigned Method = llvm::StringSwitch<unsigned>(Name)
430       .Case("legacy", CodeGenOptions::Legacy)
431       .Case("non-legacy", CodeGenOptions::NonLegacy)
432       .Case("mixed", CodeGenOptions::Mixed)
433       .Default(~0U);
434     if (Method == ~0U) {
435       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
436       Success = false;
437     } else {
438       Opts.setObjCDispatchMethod(
439         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
440     }
441   }
442 
443   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
444     StringRef Name = A->getValue();
445     unsigned Model = llvm::StringSwitch<unsigned>(Name)
446         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
447         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
448         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
449         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
450         .Default(~0U);
451     if (Model == ~0U) {
452       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
453       Success = false;
454     } else {
455       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
456     }
457   }
458 
459   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
460     StringRef Val = A->getValue();
461     if (Val == "fast")
462       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
463     else if (Val == "on")
464       Opts.setFPContractMode(CodeGenOptions::FPC_On);
465     else if (Val == "off")
466       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
467     else
468       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
469   }
470 
471   return Success;
472 }
473 
474 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
475                                       ArgList &Args) {
476   using namespace options;
477   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
478   Opts.Targets = Args.getAllArgValues(OPT_MT);
479   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
480   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
481   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
482   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
483   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
484   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
485 }
486 
487 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
488                                 DiagnosticsEngine *Diags) {
489   using namespace options;
490   bool Success = true;
491 
492   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
493   Opts.DiagnosticSerializationFile =
494     Args.getLastArgValue(OPT_diagnostic_serialized_file);
495   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
496   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
497   Opts.Pedantic = Args.hasArg(OPT_pedantic);
498   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
499   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
500   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
501   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
502                                  OPT_fno_show_column,
503                                  /*Default=*/true);
504   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
505   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
506   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
507 
508   // Default behavior is to not to show note include stacks.
509   Opts.ShowNoteIncludeStack = false;
510   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
511                                OPT_fno_diagnostics_show_note_include_stack))
512     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
513       Opts.ShowNoteIncludeStack = true;
514 
515   StringRef ShowOverloads =
516     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
517   if (ShowOverloads == "best")
518     Opts.setShowOverloads(Ovl_Best);
519   else if (ShowOverloads == "all")
520     Opts.setShowOverloads(Ovl_All);
521   else {
522     Success = false;
523     if (Diags)
524       Diags->Report(diag::err_drv_invalid_value)
525       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
526       << ShowOverloads;
527   }
528 
529   StringRef ShowCategory =
530     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
531   if (ShowCategory == "none")
532     Opts.ShowCategories = 0;
533   else if (ShowCategory == "id")
534     Opts.ShowCategories = 1;
535   else if (ShowCategory == "name")
536     Opts.ShowCategories = 2;
537   else {
538     Success = false;
539     if (Diags)
540       Diags->Report(diag::err_drv_invalid_value)
541       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
542       << ShowCategory;
543   }
544 
545   StringRef Format =
546     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
547   if (Format == "clang")
548     Opts.setFormat(DiagnosticOptions::Clang);
549   else if (Format == "msvc")
550     Opts.setFormat(DiagnosticOptions::Msvc);
551   else if (Format == "vi")
552     Opts.setFormat(DiagnosticOptions::Vi);
553   else {
554     Success = false;
555     if (Diags)
556       Diags->Report(diag::err_drv_invalid_value)
557       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
558       << Format;
559   }
560 
561   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
562   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
563   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
564   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
565   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
566   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
567   Opts.WarnOnSpellCheck = Args.hasArg(OPT_fwarn_on_spellcheck);
568   Opts.ErrorLimit = Args.getLastArgIntValue(OPT_ferror_limit, 0, Diags);
569   Opts.MacroBacktraceLimit
570     = Args.getLastArgIntValue(OPT_fmacro_backtrace_limit,
571                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
572   Opts.TemplateBacktraceLimit
573     = Args.getLastArgIntValue(OPT_ftemplate_backtrace_limit,
574                          DiagnosticOptions::DefaultTemplateBacktraceLimit,
575                          Diags);
576   Opts.ConstexprBacktraceLimit
577     = Args.getLastArgIntValue(OPT_fconstexpr_backtrace_limit,
578                          DiagnosticOptions::DefaultConstexprBacktraceLimit,
579                          Diags);
580   Opts.TabStop = Args.getLastArgIntValue(OPT_ftabstop,
581                                     DiagnosticOptions::DefaultTabStop, Diags);
582   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
583     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
584     if (Diags)
585       Diags->Report(diag::warn_ignoring_ftabstop_value)
586       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
587   }
588   Opts.MessageLength = Args.getLastArgIntValue(OPT_fmessage_length, 0, Diags);
589   addWarningArgs(Args, Opts.Warnings);
590 
591   return Success;
592 }
593 
594 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
595   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
596 }
597 
598 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
599                                    DiagnosticsEngine &Diags) {
600   using namespace options;
601   Opts.ProgramAction = frontend::ParseSyntaxOnly;
602   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
603     switch (A->getOption().getID()) {
604     default:
605       llvm_unreachable("Invalid option in group!");
606     case OPT_ast_list:
607       Opts.ProgramAction = frontend::ASTDeclList; break;
608     case OPT_ast_dump:
609       Opts.ProgramAction = frontend::ASTDump; break;
610     case OPT_ast_dump_xml:
611       Opts.ProgramAction = frontend::ASTDumpXML; break;
612     case OPT_ast_print:
613       Opts.ProgramAction = frontend::ASTPrint; break;
614     case OPT_ast_view:
615       Opts.ProgramAction = frontend::ASTView; break;
616     case OPT_dump_raw_tokens:
617       Opts.ProgramAction = frontend::DumpRawTokens; break;
618     case OPT_dump_tokens:
619       Opts.ProgramAction = frontend::DumpTokens; break;
620     case OPT_S:
621       Opts.ProgramAction = frontend::EmitAssembly; break;
622     case OPT_emit_llvm_bc:
623       Opts.ProgramAction = frontend::EmitBC; break;
624     case OPT_emit_html:
625       Opts.ProgramAction = frontend::EmitHTML; break;
626     case OPT_emit_llvm:
627       Opts.ProgramAction = frontend::EmitLLVM; break;
628     case OPT_emit_llvm_only:
629       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
630     case OPT_emit_codegen_only:
631       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
632     case OPT_emit_obj:
633       Opts.ProgramAction = frontend::EmitObj; break;
634     case OPT_fixit_EQ:
635       Opts.FixItSuffix = A->getValue();
636       // fall-through!
637     case OPT_fixit:
638       Opts.ProgramAction = frontend::FixIt; break;
639     case OPT_emit_module:
640       Opts.ProgramAction = frontend::GenerateModule; break;
641     case OPT_emit_pch:
642       Opts.ProgramAction = frontend::GeneratePCH; break;
643     case OPT_emit_pth:
644       Opts.ProgramAction = frontend::GeneratePTH; break;
645     case OPT_init_only:
646       Opts.ProgramAction = frontend::InitOnly; break;
647     case OPT_fsyntax_only:
648       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
649     case OPT_module_file_info:
650       Opts.ProgramAction = frontend::ModuleFileInfo; break;
651     case OPT_print_decl_contexts:
652       Opts.ProgramAction = frontend::PrintDeclContext; break;
653     case OPT_print_preamble:
654       Opts.ProgramAction = frontend::PrintPreamble; break;
655     case OPT_E:
656       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
657     case OPT_rewrite_macros:
658       Opts.ProgramAction = frontend::RewriteMacros; break;
659     case OPT_rewrite_objc:
660       Opts.ProgramAction = frontend::RewriteObjC; break;
661     case OPT_rewrite_test:
662       Opts.ProgramAction = frontend::RewriteTest; break;
663     case OPT_analyze:
664       Opts.ProgramAction = frontend::RunAnalysis; break;
665     case OPT_migrate:
666       Opts.ProgramAction = frontend::MigrateSource; break;
667     case OPT_Eonly:
668       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
669     }
670   }
671 
672   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
673     Opts.Plugins.push_back(A->getValue(0));
674     Opts.ProgramAction = frontend::PluginAction;
675     Opts.ActionName = A->getValue();
676 
677     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
678            end = Args.filtered_end(); it != end; ++it) {
679       if ((*it)->getValue(0) == Opts.ActionName)
680         Opts.PluginArgs.push_back((*it)->getValue(1));
681     }
682   }
683 
684   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
685   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
686   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
687     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
688            end = Args.filtered_end(); it != end; ++it) {
689       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
690         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
691     }
692   }
693 
694   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
695     Opts.CodeCompletionAt =
696       ParsedSourceLocation::FromString(A->getValue());
697     if (Opts.CodeCompletionAt.FileName.empty())
698       Diags.Report(diag::err_drv_invalid_value)
699         << A->getAsString(Args) << A->getValue();
700   }
701   Opts.DisableFree = Args.hasArg(OPT_disable_free);
702 
703   Opts.OutputFile = Args.getLastArgValue(OPT_o);
704   Opts.Plugins = Args.getAllArgValues(OPT_load);
705   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
706   Opts.ShowHelp = Args.hasArg(OPT_help);
707   Opts.ShowStats = Args.hasArg(OPT_print_stats);
708   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
709   Opts.ShowVersion = Args.hasArg(OPT_version);
710   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
711   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
712   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
713   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
714   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
715   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
716   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
717   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
718   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
719 
720   Opts.CodeCompleteOpts.IncludeMacros
721     = Args.hasArg(OPT_code_completion_macros);
722   Opts.CodeCompleteOpts.IncludeCodePatterns
723     = Args.hasArg(OPT_code_completion_patterns);
724   Opts.CodeCompleteOpts.IncludeGlobals
725     = !Args.hasArg(OPT_no_code_completion_globals);
726   Opts.CodeCompleteOpts.IncludeBriefComments
727     = Args.hasArg(OPT_code_completion_brief_comments);
728 
729   Opts.OverrideRecordLayoutsFile
730     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
731   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
732                                      OPT_arcmt_modify,
733                                      OPT_arcmt_migrate)) {
734     switch (A->getOption().getID()) {
735     default:
736       llvm_unreachable("missed a case");
737     case OPT_arcmt_check:
738       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
739       break;
740     case OPT_arcmt_modify:
741       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
742       break;
743     case OPT_arcmt_migrate:
744       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
745       break;
746     }
747   }
748   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
749   Opts.ARCMTMigrateReportOut
750     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
751   Opts.ARCMTMigrateEmitARCErrors
752     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
753 
754   if (Args.hasArg(OPT_objcmt_migrate_literals))
755     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
756   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
757     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
758 
759   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
760       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
761     Diags.Report(diag::err_drv_argument_not_allowed_with)
762       << "ARC migration" << "ObjC migration";
763   }
764 
765   InputKind DashX = IK_None;
766   if (const Arg *A = Args.getLastArg(OPT_x)) {
767     DashX = llvm::StringSwitch<InputKind>(A->getValue())
768       .Case("c", IK_C)
769       .Case("cl", IK_OpenCL)
770       .Case("cuda", IK_CUDA)
771       .Case("c++", IK_CXX)
772       .Case("objective-c", IK_ObjC)
773       .Case("objective-c++", IK_ObjCXX)
774       .Case("cpp-output", IK_PreprocessedC)
775       .Case("assembler-with-cpp", IK_Asm)
776       .Case("c++-cpp-output", IK_PreprocessedCXX)
777       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
778       .Case("objc-cpp-output", IK_PreprocessedObjC)
779       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
780       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
781       .Case("c-header", IK_C)
782       .Case("cl-header", IK_OpenCL)
783       .Case("objective-c-header", IK_ObjC)
784       .Case("c++-header", IK_CXX)
785       .Case("objective-c++-header", IK_ObjCXX)
786       .Cases("ast", "pcm", IK_AST)
787       .Case("ir", IK_LLVM_IR)
788       .Default(IK_None);
789     if (DashX == IK_None)
790       Diags.Report(diag::err_drv_invalid_value)
791         << A->getAsString(Args) << A->getValue();
792   }
793 
794   // '-' is the default input if none is given.
795   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
796   Opts.Inputs.clear();
797   if (Inputs.empty())
798     Inputs.push_back("-");
799   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
800     InputKind IK = DashX;
801     if (IK == IK_None) {
802       IK = FrontendOptions::getInputKindForExtension(
803         StringRef(Inputs[i]).rsplit('.').second);
804       // FIXME: Remove this hack.
805       if (i == 0)
806         DashX = IK;
807     }
808     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
809   }
810 
811   return DashX;
812 }
813 
814 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
815                                                  void *MainAddr) {
816   llvm::sys::Path P = llvm::sys::Path::GetMainExecutable(Argv0, MainAddr);
817 
818   if (!P.isEmpty()) {
819     P.eraseComponent();  // Remove /clang from foo/bin/clang
820     P.eraseComponent();  // Remove /bin   from foo/bin
821 
822     // Get foo/lib/clang/<version>/include
823     P.appendComponent("lib");
824     P.appendComponent("clang");
825     P.appendComponent(CLANG_VERSION_STRING);
826   }
827 
828   return P.str();
829 }
830 
831 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
832   using namespace options;
833   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
834   Opts.Verbose = Args.hasArg(OPT_v);
835   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
836   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
837   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
838   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
839     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
840   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
841   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
842   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
843   Opts.ModuleCachePruneInterval
844     = Args.getLastArgIntValue(OPT_fmodules_prune_interval, 7*24*60*60);
845   Opts.ModuleCachePruneAfter
846     = Args.getLastArgIntValue(OPT_fmodules_prune_after, 31*24*60*60);
847   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
848        ie = Args.filtered_end(); it != ie; ++it) {
849     StringRef MacroDef = (*it)->getValue();
850     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
851   }
852 
853   // Add -I..., -F..., and -index-header-map options in order.
854   bool IsIndexHeaderMap = false;
855   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
856                                              OPT_index_header_map),
857        ie = Args.filtered_end(); it != ie; ++it) {
858     if ((*it)->getOption().matches(OPT_index_header_map)) {
859       // -index-header-map applies to the next -I or -F.
860       IsIndexHeaderMap = true;
861       continue;
862     }
863 
864     frontend::IncludeDirGroup Group
865       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
866 
867     Opts.AddPath((*it)->getValue(), Group,
868                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
869     IsIndexHeaderMap = false;
870   }
871 
872   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
873   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
874   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
875                                              OPT_iwithprefixbefore),
876          ie = Args.filtered_end(); it != ie; ++it) {
877     const Arg *A = *it;
878     if (A->getOption().matches(OPT_iprefix))
879       Prefix = A->getValue();
880     else if (A->getOption().matches(OPT_iwithprefix))
881       Opts.AddPath(Prefix.str() + A->getValue(),
882                    frontend::After, false, true);
883     else
884       Opts.AddPath(Prefix.str() + A->getValue(),
885                    frontend::Angled, false, true);
886   }
887 
888   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
889          ie = Args.filtered_end(); it != ie; ++it)
890     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
891   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
892          ie = Args.filtered_end(); it != ie; ++it)
893     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
894   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
895          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
896     Opts.AddPath((*it)->getValue(), frontend::System, false,
897                  !(*it)->getOption().matches(OPT_iwithsysroot));
898   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
899          ie = Args.filtered_end(); it != ie; ++it)
900     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
901 
902   // Add the paths for the various language specific isystem flags.
903   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
904        ie = Args.filtered_end(); it != ie; ++it)
905     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
906   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
907        ie = Args.filtered_end(); it != ie; ++it)
908     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
909   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
910        ie = Args.filtered_end(); it != ie; ++it)
911     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
912   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
913        ie = Args.filtered_end(); it != ie; ++it)
914     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
915 
916   // Add the internal paths from a driver that detects standard include paths.
917   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
918                                             OPT_internal_externc_isystem),
919                     E = Args.filtered_end();
920        I != E; ++I) {
921     frontend::IncludeDirGroup Group = frontend::System;
922     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
923       Group = frontend::ExternCSystem;
924     Opts.AddPath((*I)->getValue(), Group, false, true);
925   }
926 
927   // Add the path prefixes which are implicitly treated as being system headers.
928   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
929                                             OPT_ino_system_prefix),
930                     E = Args.filtered_end();
931        I != E; ++I)
932     Opts.AddSystemHeaderPrefix((*I)->getValue(),
933                                (*I)->getOption().matches(OPT_isystem_prefix));
934 }
935 
936 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
937                                          LangStandard::Kind LangStd) {
938   // Set some properties which depend solely on the input kind; it would be nice
939   // to move these to the language standard, and have the driver resolve the
940   // input kind + language standard.
941   if (IK == IK_Asm) {
942     Opts.AsmPreprocessor = 1;
943   } else if (IK == IK_ObjC ||
944              IK == IK_ObjCXX ||
945              IK == IK_PreprocessedObjC ||
946              IK == IK_PreprocessedObjCXX) {
947     Opts.ObjC1 = Opts.ObjC2 = 1;
948   }
949 
950   if (LangStd == LangStandard::lang_unspecified) {
951     // Based on the base language, pick one.
952     switch (IK) {
953     case IK_None:
954     case IK_AST:
955     case IK_LLVM_IR:
956       llvm_unreachable("Invalid input kind!");
957     case IK_OpenCL:
958       LangStd = LangStandard::lang_opencl;
959       break;
960     case IK_CUDA:
961       LangStd = LangStandard::lang_cuda;
962       break;
963     case IK_Asm:
964     case IK_C:
965     case IK_PreprocessedC:
966     case IK_ObjC:
967     case IK_PreprocessedObjC:
968       LangStd = LangStandard::lang_gnu99;
969       break;
970     case IK_CXX:
971     case IK_PreprocessedCXX:
972     case IK_ObjCXX:
973     case IK_PreprocessedObjCXX:
974       LangStd = LangStandard::lang_gnucxx98;
975       break;
976     }
977   }
978 
979   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
980   Opts.LineComment = Std.hasLineComments();
981   Opts.C99 = Std.isC99();
982   Opts.C11 = Std.isC11();
983   Opts.CPlusPlus = Std.isCPlusPlus();
984   Opts.CPlusPlus11 = Std.isCPlusPlus11();
985   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
986   Opts.Digraphs = Std.hasDigraphs();
987   Opts.GNUMode = Std.isGNUMode();
988   Opts.GNUInline = !Std.isC99();
989   Opts.HexFloats = Std.hasHexFloats();
990   Opts.ImplicitInt = Std.hasImplicitInt();
991 
992   // Set OpenCL Version.
993   if (LangStd == LangStandard::lang_opencl) {
994     Opts.OpenCL = 1;
995     Opts.OpenCLVersion = 100;
996   }
997   else if (LangStd == LangStandard::lang_opencl11) {
998       Opts.OpenCL = 1;
999       Opts.OpenCLVersion = 110;
1000   }
1001   else if (LangStd == LangStandard::lang_opencl12) {
1002     Opts.OpenCL = 1;
1003     Opts.OpenCLVersion = 120;
1004   }
1005 
1006   // OpenCL has some additional defaults.
1007   if (Opts.OpenCL) {
1008     Opts.AltiVec = 0;
1009     Opts.CXXOperatorNames = 1;
1010     Opts.LaxVectorConversions = 0;
1011     Opts.DefaultFPContract = 1;
1012     Opts.NativeHalfType = 1;
1013   }
1014 
1015   if (LangStd == LangStandard::lang_cuda)
1016     Opts.CUDA = 1;
1017 
1018   // OpenCL and C++ both have bool, true, false keywords.
1019   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1020 
1021   // C++ has wchar_t keyword.
1022   Opts.WChar = Opts.CPlusPlus;
1023 
1024   Opts.GNUKeywords = Opts.GNUMode;
1025   Opts.CXXOperatorNames = Opts.CPlusPlus;
1026 
1027   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1028   // is specified, or -std is set to a conforming mode.
1029   Opts.Trigraphs = !Opts.GNUMode;
1030 
1031   Opts.DollarIdents = !Opts.AsmPreprocessor;
1032 }
1033 
1034 /// Attempt to parse a visibility value out of the given argument.
1035 static Visibility parseVisibility(Arg *arg, ArgList &args,
1036                                   DiagnosticsEngine &diags) {
1037   StringRef value = arg->getValue();
1038   if (value == "default") {
1039     return DefaultVisibility;
1040   } else if (value == "hidden") {
1041     return HiddenVisibility;
1042   } else if (value == "protected") {
1043     // FIXME: diagnose if target does not support protected visibility
1044     return ProtectedVisibility;
1045   }
1046 
1047   diags.Report(diag::err_drv_invalid_value)
1048     << arg->getAsString(args) << value;
1049   return DefaultVisibility;
1050 }
1051 
1052 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1053                           DiagnosticsEngine &Diags) {
1054   // FIXME: Cleanup per-file based stuff.
1055   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1056   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1057     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1058 #define LANGSTANDARD(id, name, desc, features) \
1059       .Case(name, LangStandard::lang_##id)
1060 #include "clang/Frontend/LangStandards.def"
1061       .Default(LangStandard::lang_unspecified);
1062     if (LangStd == LangStandard::lang_unspecified)
1063       Diags.Report(diag::err_drv_invalid_value)
1064         << A->getAsString(Args) << A->getValue();
1065     else {
1066       // Valid standard, check to make sure language and standard are compatable.
1067       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1068       switch (IK) {
1069       case IK_C:
1070       case IK_ObjC:
1071       case IK_PreprocessedC:
1072       case IK_PreprocessedObjC:
1073         if (!(Std.isC89() || Std.isC99()))
1074           Diags.Report(diag::err_drv_argument_not_allowed_with)
1075             << A->getAsString(Args) << "C/ObjC";
1076         break;
1077       case IK_CXX:
1078       case IK_ObjCXX:
1079       case IK_PreprocessedCXX:
1080       case IK_PreprocessedObjCXX:
1081         if (!Std.isCPlusPlus())
1082           Diags.Report(diag::err_drv_argument_not_allowed_with)
1083             << A->getAsString(Args) << "C++/ObjC++";
1084         break;
1085       case IK_OpenCL:
1086         if (!Std.isC99())
1087           Diags.Report(diag::err_drv_argument_not_allowed_with)
1088             << A->getAsString(Args) << "OpenCL";
1089         break;
1090       case IK_CUDA:
1091         if (!Std.isCPlusPlus())
1092           Diags.Report(diag::err_drv_argument_not_allowed_with)
1093             << A->getAsString(Args) << "CUDA";
1094         break;
1095       default:
1096         break;
1097       }
1098     }
1099   }
1100 
1101   // -cl-std only applies for OpenCL language standards.
1102   // Override the -std option in this case.
1103   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1104     LangStandard::Kind OpenCLLangStd
1105     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1106     .Case("CL", LangStandard::lang_opencl)
1107     .Case("CL1.1", LangStandard::lang_opencl11)
1108     .Case("CL1.2", LangStandard::lang_opencl12)
1109     .Default(LangStandard::lang_unspecified);
1110 
1111     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1112       Diags.Report(diag::err_drv_invalid_value)
1113       << A->getAsString(Args) << A->getValue();
1114     }
1115     else
1116       LangStd = OpenCLLangStd;
1117   }
1118 
1119   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1120 
1121   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1122   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1123   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1124   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1125   // name, as it doesn't seem a useful distinction.
1126   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1127                                   Opts.GNUKeywords);
1128 
1129   if (Args.hasArg(OPT_fno_operator_names))
1130     Opts.CXXOperatorNames = 0;
1131 
1132   if (Opts.ObjC1) {
1133     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1134       StringRef value = arg->getValue();
1135       if (Opts.ObjCRuntime.tryParse(value))
1136         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1137     }
1138 
1139     if (Args.hasArg(OPT_fobjc_gc_only))
1140       Opts.setGC(LangOptions::GCOnly);
1141     else if (Args.hasArg(OPT_fobjc_gc))
1142       Opts.setGC(LangOptions::HybridGC);
1143     else if (Args.hasArg(OPT_fobjc_arc)) {
1144       Opts.ObjCAutoRefCount = 1;
1145       if (!Opts.ObjCRuntime.allowsARC())
1146         Diags.Report(diag::err_arc_unsupported_on_runtime);
1147 
1148       // Only set ObjCARCWeak if ARC is enabled.
1149       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1150         Opts.ObjCARCWeak = 1;
1151       else
1152         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1153     }
1154 
1155     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1156       Opts.ObjCInferRelatedResultType = 0;
1157   }
1158 
1159   if (Args.hasArg(OPT_fgnu89_inline))
1160     Opts.GNUInline = 1;
1161 
1162   if (Args.hasArg(OPT_fapple_kext)) {
1163     if (!Opts.CPlusPlus)
1164       Diags.Report(diag::warn_c_kext);
1165     else
1166       Opts.AppleKext = 1;
1167   }
1168 
1169   if (Args.hasArg(OPT_print_ivar_layout))
1170     Opts.ObjCGCBitmapPrint = 1;
1171   if (Args.hasArg(OPT_fno_constant_cfstrings))
1172     Opts.NoConstantCFStrings = 1;
1173 
1174   if (Args.hasArg(OPT_faltivec))
1175     Opts.AltiVec = 1;
1176 
1177   if (Args.hasArg(OPT_pthread))
1178     Opts.POSIXThreads = 1;
1179 
1180   // The value-visibility mode defaults to "default".
1181   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1182     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1183   } else {
1184     Opts.setValueVisibilityMode(DefaultVisibility);
1185   }
1186 
1187   // The type-visibility mode defaults to the value-visibility mode.
1188   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1189     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1190   } else {
1191     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1192   }
1193 
1194   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1195     Opts.InlineVisibilityHidden = 1;
1196 
1197   if (Args.hasArg(OPT_ftrapv)) {
1198     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1199     // Set the handler, if one is specified.
1200     Opts.OverflowHandler =
1201         Args.getLastArgValue(OPT_ftrapv_handler);
1202   }
1203   else if (Args.hasArg(OPT_fwrapv))
1204     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1205 
1206   if (Args.hasArg(OPT_trigraphs))
1207     Opts.Trigraphs = 1;
1208 
1209   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1210                                    OPT_fno_dollars_in_identifiers,
1211                                    Opts.DollarIdents);
1212   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1213   Opts.MicrosoftExt
1214     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1215   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1216   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1217   Opts.MSCVersion = Args.getLastArgIntValue(OPT_fmsc_version, 0, Diags);
1218   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1219   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1220   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1221                                    Opts.ConstStrings);
1222   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1223     Opts.LaxVectorConversions = 0;
1224   if (Args.hasArg(OPT_fno_threadsafe_statics))
1225     Opts.ThreadsafeStatics = 0;
1226   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1227   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1228   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1229   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1230   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1231 
1232   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1233   Opts.Blocks = Args.hasArg(OPT_fblocks);
1234   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1235   Opts.Modules = Args.hasArg(OPT_fmodules);
1236   Opts.CharIsSigned = !Args.hasArg(OPT_fno_signed_char);
1237   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1238   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1239   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1240   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1241   Opts.FormatExtensions = Args.hasArg(OPT_fformat_extensions);
1242   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1243   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1244   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1245   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1246   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1247   Opts.MathErrno = Args.hasArg(OPT_fmath_errno);
1248   Opts.InstantiationDepth = Args.getLastArgIntValue(OPT_ftemplate_depth, 512,
1249                                                     Diags);
1250   Opts.ConstexprCallDepth = Args.getLastArgIntValue(OPT_fconstexpr_depth, 512,
1251                                                     Diags);
1252   Opts.BracketDepth = Args.getLastArgIntValue(OPT_fbracket_depth, 256, Diags);
1253   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1254   Opts.NumLargeByValueCopy = Args.getLastArgIntValue(OPT_Wlarge_by_value_copy_EQ,
1255                                                     0, Diags);
1256   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1257   Opts.ObjCConstantStringClass =
1258     Args.getLastArgValue(OPT_fconstant_string_class);
1259   Opts.ObjCDefaultSynthProperties =
1260     Args.hasArg(OPT_fobjc_default_synthesize_properties);
1261   Opts.EncodeExtendedBlockSig =
1262     Args.hasArg(OPT_fencode_extended_block_signature);
1263   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1264   Opts.PackStruct = Args.getLastArgIntValue(OPT_fpack_struct_EQ, 0, Diags);
1265   Opts.PICLevel = Args.getLastArgIntValue(OPT_pic_level, 0, Diags);
1266   Opts.PIELevel = Args.getLastArgIntValue(OPT_pie_level, 0, Diags);
1267   Opts.Static = Args.hasArg(OPT_static_define);
1268   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1269   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1270                         || Args.hasArg(OPT_fdump_record_layouts);
1271   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1272   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1273   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1274   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1275   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1276   Opts.MRTD = Args.hasArg(OPT_mrtd);
1277   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1278   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1279   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1280   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1281   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1282   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1283   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1284   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1285 
1286   // Check if -fopenmp is specified.
1287   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1288 
1289   // Record whether the __DEPRECATED define was requested.
1290   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1291                                  OPT_fno_deprecated_macro,
1292                                  Opts.Deprecated);
1293 
1294   // FIXME: Eliminate this dependency.
1295   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1296        OptSize = getOptimizationLevelSize(Args, IK, Diags);
1297   Opts.Optimize = Opt != 0;
1298   Opts.OptimizeSize = OptSize != 0;
1299 
1300   // This is the __NO_INLINE__ define, which just depends on things like the
1301   // optimization level and -fno-inline, not actually whether the backend has
1302   // inlining enabled.
1303   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1304 
1305   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1306   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1307 
1308   Opts.RetainCommentsFromSystemHeaders =
1309       Args.hasArg(OPT_fretain_comments_from_system_headers);
1310 
1311   unsigned SSP = Args.getLastArgIntValue(OPT_stack_protector, 0, Diags);
1312   switch (SSP) {
1313   default:
1314     Diags.Report(diag::err_drv_invalid_value)
1315       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1316     break;
1317   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1318   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1319   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1320   }
1321 
1322   // Parse -fsanitize= arguments.
1323   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1324   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1325     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1326     // efficiently map string values to them. Perform the mapping indirectly:
1327     // convert strings to enumerated values, then switch over the enum to set
1328     // the right bitfield value.
1329     enum Sanitizer {
1330 #define SANITIZER(NAME, ID) \
1331       ID,
1332 #include "clang/Basic/Sanitizers.def"
1333       Unknown
1334     };
1335     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1336 #define SANITIZER(NAME, ID) \
1337               .Case(NAME, ID)
1338 #include "clang/Basic/Sanitizers.def"
1339               .Default(Unknown)) {
1340 #define SANITIZER(NAME, ID) \
1341     case ID: \
1342       Opts.Sanitize.ID = true; \
1343       break;
1344 #include "clang/Basic/Sanitizers.def"
1345 
1346     case Unknown:
1347       Diags.Report(diag::err_drv_invalid_value)
1348         << "-fsanitize=" << Sanitizers[I];
1349       break;
1350     }
1351   }
1352 }
1353 
1354 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1355                                   FileManager &FileMgr,
1356                                   DiagnosticsEngine &Diags) {
1357   using namespace options;
1358   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1359   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1360   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1361       Opts.TokenCache = A->getValue();
1362   else
1363     Opts.TokenCache = Opts.ImplicitPTHInclude;
1364   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1365   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1366   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1367 
1368   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1369   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1370          ie = Args.filtered_end(); it != ie; ++it) {
1371     const Arg *A = *it;
1372     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1373   }
1374 
1375   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1376     StringRef Value(A->getValue());
1377     size_t Comma = Value.find(',');
1378     unsigned Bytes = 0;
1379     unsigned EndOfLine = 0;
1380 
1381     if (Comma == StringRef::npos ||
1382         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1383         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1384       Diags.Report(diag::err_drv_preamble_format);
1385     else {
1386       Opts.PrecompiledPreambleBytes.first = Bytes;
1387       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1388     }
1389   }
1390 
1391   // Add macros from the command line.
1392   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1393          ie = Args.filtered_end(); it != ie; ++it) {
1394     if ((*it)->getOption().matches(OPT_D))
1395       Opts.addMacroDef((*it)->getValue());
1396     else
1397       Opts.addMacroUndef((*it)->getValue());
1398   }
1399 
1400   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1401 
1402   // Add the ordered list of -includes.
1403   for (arg_iterator it = Args.filtered_begin(OPT_include),
1404          ie = Args.filtered_end(); it != ie; ++it) {
1405     const Arg *A = *it;
1406     Opts.Includes.push_back(A->getValue());
1407   }
1408 
1409   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1410          ie = Args.filtered_end(); it != ie; ++it) {
1411     const Arg *A = *it;
1412     Opts.ChainedIncludes.push_back(A->getValue());
1413   }
1414 
1415   // Include 'altivec.h' if -faltivec option present
1416   if (Args.hasArg(OPT_faltivec))
1417     Opts.Includes.push_back("altivec.h");
1418 
1419   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1420          ie = Args.filtered_end(); it != ie; ++it) {
1421     const Arg *A = *it;
1422     std::pair<StringRef,StringRef> Split =
1423       StringRef(A->getValue()).split(';');
1424 
1425     if (Split.second.empty()) {
1426       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1427       continue;
1428     }
1429 
1430     Opts.addRemappedFile(Split.first, Split.second);
1431   }
1432 
1433   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1434     StringRef Name = A->getValue();
1435     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1436       .Case("libc++", ARCXX_libcxx)
1437       .Case("libstdc++", ARCXX_libstdcxx)
1438       .Case("none", ARCXX_nolib)
1439       .Default(~0U);
1440     if (Library == ~0U)
1441       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1442     else
1443       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1444   }
1445 }
1446 
1447 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1448                                         ArgList &Args,
1449                                         frontend::ActionKind Action) {
1450   using namespace options;
1451 
1452   switch (Action) {
1453   case frontend::ASTDeclList:
1454   case frontend::ASTDump:
1455   case frontend::ASTDumpXML:
1456   case frontend::ASTPrint:
1457   case frontend::ASTView:
1458   case frontend::EmitAssembly:
1459   case frontend::EmitBC:
1460   case frontend::EmitHTML:
1461   case frontend::EmitLLVM:
1462   case frontend::EmitLLVMOnly:
1463   case frontend::EmitCodeGenOnly:
1464   case frontend::EmitObj:
1465   case frontend::FixIt:
1466   case frontend::GenerateModule:
1467   case frontend::GeneratePCH:
1468   case frontend::GeneratePTH:
1469   case frontend::ParseSyntaxOnly:
1470   case frontend::ModuleFileInfo:
1471   case frontend::PluginAction:
1472   case frontend::PrintDeclContext:
1473   case frontend::RewriteObjC:
1474   case frontend::RewriteTest:
1475   case frontend::RunAnalysis:
1476   case frontend::MigrateSource:
1477     Opts.ShowCPP = 0;
1478     break;
1479 
1480   case frontend::DumpRawTokens:
1481   case frontend::DumpTokens:
1482   case frontend::InitOnly:
1483   case frontend::PrintPreamble:
1484   case frontend::PrintPreprocessedInput:
1485   case frontend::RewriteMacros:
1486   case frontend::RunPreprocessorOnly:
1487     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1488     break;
1489   }
1490 
1491   Opts.ShowComments = Args.hasArg(OPT_C);
1492   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1493   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1494   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1495   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1496 }
1497 
1498 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1499   using namespace options;
1500   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1501   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1502   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1503   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1504   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1505   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1506 
1507   // Use the default target triple if unspecified.
1508   if (Opts.Triple.empty())
1509     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1510 }
1511 
1512 //
1513 
1514 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1515                                         const char *const *ArgBegin,
1516                                         const char *const *ArgEnd,
1517                                         DiagnosticsEngine &Diags) {
1518   bool Success = true;
1519 
1520   // Parse the arguments.
1521   OwningPtr<OptTable> Opts(createDriverOptTable());
1522   unsigned MissingArgIndex, MissingArgCount;
1523   OwningPtr<InputArgList> Args(
1524     Opts->ParseArgs(ArgBegin, ArgEnd,MissingArgIndex, MissingArgCount));
1525 
1526   // Check for missing argument error.
1527   if (MissingArgCount) {
1528     Diags.Report(diag::err_drv_missing_argument)
1529       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1530     Success = false;
1531   }
1532 
1533   // Issue errors on unknown arguments.
1534   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1535          ie = Args->filtered_end(); it != ie; ++it) {
1536     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1537     Success = false;
1538   }
1539 
1540   // Issue errors on arguments that are not valid for CC1.
1541   for (ArgList::iterator I = Args->begin(), E = Args->end();
1542        I != E; ++I) {
1543     if (!(*I)->getOption().hasFlag(options::CC1Option)) {
1544       Diags.Report(diag::err_drv_unknown_argument) << (*I)->getAsString(*Args);
1545       Success = false;
1546     }
1547   }
1548 
1549   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1550   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1551   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1552   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1553             && Success;
1554   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1555   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1556   // FIXME: We shouldn't have to pass the DashX option around here
1557   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1558   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1559             && Success;
1560   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1561   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1562     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1563     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1564       Res.getLangOpts()->ObjCExceptions = 1;
1565   }
1566   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1567   // PCH file and find the original header name. Remove the need to do that in
1568   // ParsePreprocessorArgs and remove the FileManager
1569   // parameters from the function and the "FileManager.h" #include.
1570   FileManager FileMgr(Res.getFileSystemOpts());
1571   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1572   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1573                               Res.getFrontendOpts().ProgramAction);
1574   ParseTargetArgs(Res.getTargetOpts(), *Args);
1575 
1576   return Success;
1577 }
1578 
1579 namespace {
1580 
1581   class ModuleSignature {
1582     SmallVector<uint64_t, 16> Data;
1583     unsigned CurBit;
1584     uint64_t CurValue;
1585 
1586   public:
1587     ModuleSignature() : CurBit(0), CurValue(0) { }
1588 
1589     void add(uint64_t Value, unsigned Bits);
1590     void add(StringRef Value);
1591     void flush();
1592 
1593     llvm::APInt getAsInteger() const;
1594   };
1595 }
1596 
1597 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1598   CurValue |= Value << CurBit;
1599   if (CurBit + NumBits < 64) {
1600     CurBit += NumBits;
1601     return;
1602   }
1603 
1604   // Add the current word.
1605   Data.push_back(CurValue);
1606 
1607   if (CurBit)
1608     CurValue = Value >> (64-CurBit);
1609   else
1610     CurValue = 0;
1611   CurBit = (CurBit+NumBits) & 63;
1612 }
1613 
1614 void ModuleSignature::flush() {
1615   if (CurBit == 0)
1616     return;
1617 
1618   Data.push_back(CurValue);
1619   CurBit = 0;
1620   CurValue = 0;
1621 }
1622 
1623 void ModuleSignature::add(StringRef Value) {
1624   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1625     add(*I, 8);
1626 }
1627 
1628 llvm::APInt ModuleSignature::getAsInteger() const {
1629   return llvm::APInt(Data.size() * 64, Data);
1630 }
1631 
1632 std::string CompilerInvocation::getModuleHash() const {
1633   // Note: For QoI reasons, the things we use as a hash here should all be
1634   // dumped via the -module-info flag.
1635   using llvm::hash_code;
1636   using llvm::hash_value;
1637   using llvm::hash_combine;
1638 
1639   // Start the signature with the compiler version.
1640   // FIXME: We'd rather use something more cryptographically sound than
1641   // CityHash, but this will do for now.
1642   hash_code code = hash_value(getClangFullRepositoryVersion());
1643 
1644   // Extend the signature with the language options
1645 #define LANGOPT(Name, Bits, Default, Description) \
1646    code = hash_combine(code, LangOpts->Name);
1647 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1648   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1649 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1650 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1651 #include "clang/Basic/LangOptions.def"
1652 
1653   // Extend the signature with the target options.
1654   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1655                       TargetOpts->ABI, TargetOpts->CXXABI,
1656                       TargetOpts->LinkerVersion);
1657   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1658     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1659 
1660   // Extend the signature with preprocessor options.
1661   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1662   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1663   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1664 
1665   std::vector<StringRef> MacroDefs;
1666   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1667             I = getPreprocessorOpts().Macros.begin(),
1668          IEnd = getPreprocessorOpts().Macros.end();
1669        I != IEnd; ++I) {
1670     // If we're supposed to ignore this macro for the purposes of modules,
1671     // don't put it into the hash.
1672     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1673       // Check whether we're ignoring this macro.
1674       StringRef MacroDef = I->first;
1675       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1676         continue;
1677     }
1678 
1679     code = hash_combine(code, I->first, I->second);
1680   }
1681 
1682   // Extend the signature with the sysroot.
1683   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1684                       hsOpts.UseStandardSystemIncludes,
1685                       hsOpts.UseStandardCXXIncludes,
1686                       hsOpts.UseLibcxx);
1687 
1688   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1689 }
1690